feat(base): make cheat's topic argument optional and drop https

cht.sh serves the same content over plain http, and requesting it
without a topic (cheat with no args) returns its general help page,
so there's no reason to require an argument. Regenerate README's
function-line links, shifted by the fix.

Author: rdavid

README.adoc

@@ -93,62 +93,62 @@ The public functions are, in alphabetical order:
 {url-base}#L105[`beuser`],
 {url-base}#L119[`bomb`],
 {url-base}#L125[`cheat`],
-{url-base}#L137[`chrono_get`],
-{url-base}#L182[`chrono_sta`],
-{url-base}#L199[`chrono_sto`],
-{url-base}#L220[`cmd_exists`],
-{url-base}#L257[`cmd_run`],
-{url-base}#L291[`cmd_runif`],
-{url-base}#L300[`cya`],
-{url-base}#L310[`die`],
-{url-base}#L318[`dng2jpg`],
-{url-base}#L327[`echo`],
-{url-base}#L347[`ellipsize`],
-{url-base}#L380[`file_exists`],
-{url-base}#L396[`gitfix`],
-{url-base}#L412[`gitlog`],
-{url-base}#L438[`grbt`],
-{url-base}#L456[`handle_pipefails`],
-{url-base}#L467[`heic2jpg`],
-{url-base}#L480[`inside`],
-{url-base}#L492[`isempty`],
-{url-base}#L521[`isfunc`],
-{url-base}#L538[`isnumber`],
-{url-base}#L550[`isreadable`],
-{url-base}#L563[`isroot`],
-{url-base}#L576[`issolid`],
-{url-base}#L614[`iswritable`],
-{url-base}#L631[`log`],
-{url-base}#L640[`loge`],
-{url-base}#L648[`logw`],
-{url-base}#L657[`map_del`],
-{url-base}#L681[`map_get`],
-{url-base}#L707[`map_put`],
-{url-base}#L728[`nmea2gpx`],
-{url-base}#L742[`pdf2jpg`],
-{url-base}#L747[`pdf2png`],
-{url-base}#L769[`prettytable`],
-{url-base}#L790[`prettyuptime`],
-{url-base}#L814[`realdir`],
-{url-base}#L828[`realpath`],
-{url-base}#L846[`retry`],
-{url-base}#L884[`rev`],
-{url-base}#L902[`semver`],
-{url-base}#L931[`should_continue`],
-{url-base}#L989[`timestamp`],
-{url-base}#L1009[`tolog`],
-{url-base}#L1015[`tologe`],
-{url-base}#L1022[`tolower`],
-{url-base}#L1040[`totsout`],
-{url-base}#L1046[`tsout`],
-{url-base}#L1055[`url_exists`],
-{url-base}#L1084[`user_exists`],
-{url-base}#L1103[`validate_cmd`],
-{url-base}#L1110[`validate_var`],
-{url-base}#L1128[`var_exists`],
-{url-base}#L1168[`ver_ge`],
-{url-base}#L1183[`vid2aud`],
-{url-base}#L1204[`ytda`].
+{url-base}#L136[`chrono_get`],
+{url-base}#L181[`chrono_sta`],
+{url-base}#L198[`chrono_sto`],
+{url-base}#L219[`cmd_exists`],
+{url-base}#L256[`cmd_run`],
+{url-base}#L290[`cmd_runif`],
+{url-base}#L299[`cya`],
+{url-base}#L309[`die`],
+{url-base}#L317[`dng2jpg`],
+{url-base}#L326[`echo`],
+{url-base}#L346[`ellipsize`],
+{url-base}#L379[`file_exists`],
+{url-base}#L395[`gitfix`],
+{url-base}#L411[`gitlog`],
+{url-base}#L437[`grbt`],
+{url-base}#L455[`handle_pipefails`],
+{url-base}#L466[`heic2jpg`],
+{url-base}#L479[`inside`],
+{url-base}#L491[`isempty`],
+{url-base}#L520[`isfunc`],
+{url-base}#L537[`isnumber`],
+{url-base}#L549[`isreadable`],
+{url-base}#L562[`isroot`],
+{url-base}#L575[`issolid`],
+{url-base}#L613[`iswritable`],
+{url-base}#L630[`log`],
+{url-base}#L639[`loge`],
+{url-base}#L647[`logw`],
+{url-base}#L656[`map_del`],
+{url-base}#L680[`map_get`],
+{url-base}#L706[`map_put`],
+{url-base}#L727[`nmea2gpx`],
+{url-base}#L741[`pdf2jpg`],
+{url-base}#L746[`pdf2png`],
+{url-base}#L768[`prettytable`],
+{url-base}#L789[`prettyuptime`],
+{url-base}#L813[`realdir`],
+{url-base}#L827[`realpath`],
+{url-base}#L845[`retry`],
+{url-base}#L883[`rev`],
+{url-base}#L901[`semver`],
+{url-base}#L930[`should_continue`],
+{url-base}#L988[`timestamp`],
+{url-base}#L1008[`tolog`],
+{url-base}#L1014[`tologe`],
+{url-base}#L1021[`tolower`],
+{url-base}#L1039[`totsout`],
+{url-base}#L1045[`tsout`],
+{url-base}#L1054[`url_exists`],
+{url-base}#L1083[`user_exists`],
+{url-base}#L1102[`validate_cmd`],
+{url-base}#L1109[`validate_var`],
+{url-base}#L1127[`var_exists`],
+{url-base}#L1167[`ver_ge`],
+{url-base}#L1182[`vid2aud`],
+{url-base}#L1203[`ytda`].
 
 Global variables carry the `BASE_` prefix.
 Clients may use them and should place temporary files under `$BASE_WIP`.
@@ -207,9 +207,9 @@ log I\'m using the shellbase.
 ----
 
 The framework provides three loggers:
-{url-base}#L631[`log`] for information,
-{url-base}#L640[`loge`] for errors, and
-{url-base}#L648[`logw`] for warnings.
+{url-base}#L630[`log`] for information,
+{url-base}#L639[`loge`] for errors, and
+{url-base}#L647[`logw`] for warnings.
 Each logger prints to standard error.
 In non-interactive mode, each also appends the message to the log file under
 a single lowercase level tag: `i` for information, `e` for errors, and `w`
@@ -233,7 +233,7 @@ eval "$(
 log I\'m using the shellbase.
 ----
 
-{url-base}#L769[`prettytable`] example:
+{url-base}#L768[`prettytable`] example:
 
 [,sh]
 ----

app/test-cheat-arg-no

@@ -3,10 +3,10 @@
 # SPDX-FileCopyrightText: 2026 David Rabkin
 # SPDX-License-Identifier: 0BSD
 #
-# Verifies that cheat fails when called without a topic.
+# Verifies that cheat fails when called with more than one topic.
 #
 # File not following:
 #  shellcheck disable=SC1090,SC1091
 . "$(CDPATH='' cd -- "$(dirname -- "$0")" && pwd -P)"/../lib/base.sh
-cheat
+cheat too many
 log Cheat sheet fetched.

lib/base.sh

@@ -121,14 +121,13 @@ bomb() {
 	base_bomb
 }
 
-# The only cheat sheet you need. The only parameter is the topic.
+# The only cheat sheet you need. The parameter is the topic.
 cheat() {
-	[ $# -eq 1 ] || {
-		loge Expected a single argument, got "$#".
+	[ $# -le 1 ] || {
+		loge Expected at most a single argument, got "$#".
 		return $BASE_RC_ARG_NO
 	}
-	cmd_exists curl || return
-	curl https://cht.sh/"$1"
+	cmd_exists curl && curl cht.sh/"${1-}"
 }
 
 # Calculates a duration from the start. There are 86400 seconds in a day,